When I was still in the Philippines, we call this a "shoulder bag", but when I get here in US, I learned to call this a "purse" because it is what my husband taught me so, but... I was so surprise when one day as I was watching movie, I heard a southern lady called it a "pocketbook". A pocketbook?!
I grew up with the thought that a pocketbook is a small especially paperback book that can be carried in the pocket.
According to Dictionary.com a pocketbook is a;
* woman's purse or handbag.
*person's financial resources or means: "The price was out of reach of his pocketbook."
*book, usually paperback, that is small enough to carry in one's coat pocket.
* notebook for carrying in one's pocket.
* wallet or billfold.
Well, I never know.